P1456 HONDA - Evaporative Emissions Control System Leakage Fuel Tank
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP purge control solenoid
- EVAP canister
- Fuel tank pressure sensor
There is a Honda factory service bulletin with information on how to diagnose the P1456 on the following Honda models:
1998 Honda Accord
1999 Honda Accord
2000 Honda Accord
Troubleshooting DTC P1456 (EVAP system leakage [fuel tank system]) in a 2003-2004 Pilot? Pinch off all the hoses between the fuel filler neck and the fuel tank, and retest. If the leak stops, replace the fuel fill cap first. If youve still got the leak after replacing the fuel fill cap, then replace the fuel filler pipe. Theres an O-ring between the plastic and threaded part of the filler neck that may be leaking.
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When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P1456 HONDA Description
The EVAP control system leak detection method improves the accuracy and frequency of the detection by determining faulty components and vapor leakage for each part. The EVAP control system (from the purge valve to the fuel tank) is divided into two parts. One is the "EVAP Canister Side" (from the EVAP two way valve to the purge valve) and the other is the "Tank Side" (from the EVAP two way valve to the fuel tank). There is 0.04 inch leak detection and 0.02 inch leak detection. If the 0.04 inch leak detection results are OK, the 0.02 inch leak detection runs.
P1456 HONDA Information for specific Honda models
P1456 1997 HONDA CIVIC
P1456 1998 HONDA CIVIC
P1456 1999 HONDA CIVIC
P1456 2000 HONDA CIVIC
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